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/*

 * @test

 * @summary Test JVM's memory resource awareness when running inside docker container

 * @requires docker.support

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 *          jdk.jartool/sun.tools.jar

 * @run driver ClassFileInstaller -jar whitebox.jar sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run driver TestMemoryAwareness

 */

import jdk.test.lib.containers.docker.DockerRunOptions;

import jdk.test.lib.containers.docker.DockerTestUtils;

public class TestMemoryAwareness {

    private static final String imageName = Common.imageName("memory");

    public static void main(String[] args) throws Exception {

        if (!DockerTestUtils.canTestDocker()) {

            return;

        }

        Common.prepareWhiteBox();

        DockerTestUtils.buildJdkDockerImage(imageName, "Dockerfile-BasicTest", "jdk-docker");

        try {

            testMemoryLimit("100m", "104857600");

            testMemoryLimit("500m", "524288000");

            testMemoryLimit("1g", "1073741824");

            testMemoryLimit("4g", "4294967296");

            testMemorySoftLimit("500m", "524288000");

            testMemorySoftLimit("1g", "1073741824");

            // Add extra 10 Mb to allocator limit, to be sure to cause OOM

            testOOM("256m", 256 + 10);

        } finally {

            DockerTestUtils.removeDockerImage(imageName);

        }

    }

    private static void testMemoryLimit(String valueToSet, String expectedTraceValue)

            throws Exception {

        Common.logNewTestCase("memory limit: " + valueToSet);

        DockerRunOptions opts = Common.newOpts(imageName)

            .addDockerOpts("--memory", valueToSet);

        Common.run(opts)

            .shouldMatch("Memory Limit is:.*" + expectedTraceValue);

    }

    private static void testMemorySoftLimit(String valueToSet, String expectedTraceValue)

            throws Exception {

        Common.logNewTestCase("memory soft limit: " + valueToSet);

        DockerRunOptions opts = Common.newOpts(imageName, "PrintContainerInfo");

        Common.addWhiteBoxOpts(opts);

        opts.addDockerOpts("--memory-reservation=" + valueToSet);

        Common.run(opts)

            .shouldMatch("Memory Soft Limit.*" + expectedTraceValue);

    }

    // provoke OOM inside the container, see how VM reacts

    private static void testOOM(String dockerMemLimit, int sizeToAllocInMb) throws Exception {

        Common.logNewTestCase("OOM");

        DockerRunOptions opts = Common.newOpts(imageName, "AttemptOOM")

            .addDockerOpts("--memory", dockerMemLimit, "--memory-swap", dockerMemLimit);

        opts.classParams.add("" + sizeToAllocInMb);

        DockerTestUtils.dockerRunJava(opts)

            .shouldHaveExitValue(1)

            .shouldContain("Entering AttemptOOM main")

            .shouldNotContain("AttemptOOM allocation successful")

            .shouldContain("java.lang.OutOfMemoryError");

    }

}